Copper containing polyazo dyestuffs



2,892,827 Patented June 30, 1959 United States Patent Ofiice COPPER CONTA'INING POLYAZO DYESTUFFS Horst Nickel, Koln-Stammheim, and Fritz Suckfiill, Leverkusen, Germany, assignors to Farbenfabriken Bayer Aktiengesellschaft, Leverkusen, Germany, a corporation of Germany No Drawing. Application July 2, 1957 Serial No. 669,440

Claims priority, application Germany August 16, 1956 3 Claims. (Cl. 260-143 'The present invention relates to copper-containing polyazo dyestufi's; more particularly it relates to copper complexes of polyazo dyestuffs corresponding to the formula its.

In this formula X means hydrogen or a sulfonic acid group and R and R stand for the same or different radicals of an azo component bearing the hydroxyl group in o-position to the azo bridge.

, Copper complexes of the above mentioned formula are obtainable by coupling diazotized amino nitronaph: thalenes of the general formula:

group, with the same or different azo components in the o-position to an enolic or phenolic hydroxyl group and by oxidizing coppering the polyazo dyestuffs thus obtained.

Coupling components suitable for the present process containing an enolic or phenolic hydroxyl group are for example: acetoacetic acid arylides, hydroxybenzenes, hydroxynaphthalenes, hydroxynaphthalene-sulfonic acids such as Z-hydroxynaphthalene-S,6-disulfonic acid, 2-hydroxynaphthalene-4-, -5-, -6-, -7- or -8-monosulfonic acid, 1-hydroxynaphthalene-4-sulfonic acid, l-hydroxynaphthalene-3,6- or -3,8-disulfonic acid, if desired N-substituted 2-aminoor -3-amino-5-hydroxynaphthalene-7-su1- fonic acid, 1,8-dihydroxynaphthalene-3,6-disulfonic acid, pyrazolones such as l-(sulfophenyl)-3-methyl-5-pyrazolones, 1 (4,8' disulfonaphthyl-[Z'D 3 methyl 5- pyrazolone, l-phenyl-3-carboxy-5-pyrazolone, hydroxylaryl azo compounds such as 4-hydroxybenzene-(1,l)- azo-benzene-4'-sulfonic acid or l-hydroxy-B-sulfo-S-chloronaphthalene [6,1] azo 2' hydroxynaphthalene- 3',6-disulfonic acid.

effected if instead of the uitro-azo compound obtained according to the invention, the polyazo or azoxy dyestulf is coppered by oxidation at the end of the process. For reacting the nitro-azo compounds which may be present in the form of their copper complexes with reducing agents for the purpose of linking two molecules via an azoor azoxy group there may be used the same or diiferent nitro-monoazo dyestuffs obtained according to the invention. 7

A modification of the process consists in coupling tetrazou'zed diaminoazm or azoxy compounds of the general formula:

son:

s oua wherein X means a hydrogen atom or a sulfonic acid The oxidizing coppering of the nitro-azo compounds or of the metal-free polyazo compounds obtainable according to the invention is carried out, for example, by the methods of the examples herein.

The reductive linkage of two molecules of the nitroazo compounds with the formation of an azoor azoxy grouping may be eifected by known methods, for example by heating the components in the presence of reducing sugars in an aqueous medium.

*The' new copper-containing poly azo dyestufis are suitable for the dyeing of vegetable fibres such as cotton or of regenerated cellulose. Dyeings are thus obtained having valuable fastness properties, particularly a good fastness to light.

The following examples are given for the purpose of illustrating the invention without, however, limiting it thereto; the parts by weight and the parts by volume being in the ratio of grams to millilitres.

Example 1 30.4 parts by weight (0.1 mol) of Z-hydroxy-naphthalene-3,6-disulfonic acid are dissolved in 300 parts by volume of water and 180 parts by volume of a 20 percent sodium carbonate solution are added thereto; the solution is combined at 0-5 C. with a diazonium salt solution obtained in usual manner from 34.8 parts by weight of 2 amino 6 nitronaphthalene 4,8 disulfonic acid. When the coupling is complete, the monoazo dyestuif thus formed is salted out with sodium chloride and isolated.

The dyestuif paste is dissolved in 1000 parts by volume of water, treated with parts by volume of a 20percent sodium acetate solution and rendered. weakly acid with acetic acid (pH approximately 5.5). After the addition of a solution of 25 parts by weight of crystalline copper sulfate in 140 parts by volume of water, 280

parts by volume of a 3 percent hydrogen peroxide solution are introduced dropwise with stirring at 5560 C. within about 3 hours and stining is continued for 1 hour. When the dropwise addition is completed, the solution is bluish violet. The monoazo dyestufi coppered by oxidation is separated by the addition of sodium chloride and isolated. a

The isolated dyestufi paste is then stirred with about 1400 parts by volume of water, treated with 140 parts by volume of sodium hydroxide solution (40 B.) and a solution of 17.3 parts by weight of glucose in 60 parts by volume of water, and maintained at about 50-70 C., until the reaction (the reduction of the nitro groups with the formation of an azo or azoxy bridge) is completed. The dyestuif is salted out'by adding sodium chloride and 2,892,827 3 4 isolated. It corresponds in "the free acid state to the obtainable by coupling 19.2 parts by weight (0.05 mol) formula: of 1-(4',8'-disulfonaphthyl-'[2'1 )-3-methyl-5-pyrazolone' N'=N =-N=N (i N=N 1103's sozn scan son; The dry dyestuft is a dark powder which dissolves in with the diazo compound from 17.4 parts by weight of water with a blue coloration and dyes cotton in blue 2-amino-6-nitronaphthalene-4,8-disulfonic acid and by shades of good fastneiss to light and Washing. treating the 'azo dyestu'fi with a copper salt and hydrogen When replacing the 2-hydroxynaphthalene-3,6 disu1- peroxide, are stirred together into 1400 parts by volume fonic acid in this example by the amounts of theazo of water and the mixture is treated with 100 parts by components listed in the following table and proeeeding Volume of sodium hydroxide solution and a in an analogous manner to that described above, valusolution of 17.3 parts by welght of glucose n 60 parts able dyestuffs are obtained which are fast to light and by volume of water. The mixture is slowly heated to generally dye cotton in blue to grey shades. 55 C ahd niaiutaiiledat 55 60 C. for about mm- H I 20 rites. en the reduction Of the nitro groups with the Parts Dyeingot'ths formation of the azo or 'azoxy bridge is completed, the y -Azo c mponent fip product is cooled down to C., salted out with sodium wag g fit chloride and isolated. If desired, the isolated product is after-coppered by 'usual methods. The dry dyestufi i-h umx ua hthaleu aentsuu ur jaoim; js' eefnls'h grey. 25 thus obtained is a dark powder which dissolves 1 n water l-hydwxynaphthalene-3,8-disulfomc field blue- 7 with a blue coloration and dyescott'on 1n reddish blue Lhydroxynaphthalene 4-sulfonic geld.--" Do. I h d 2-hydroxynaphthalene-t-sulfonic acid greenish grey. 5 a 2-hydr0xynaphthalene-fieulfvnic acid blue- When replacing in the last-mentioned copper-contain- 2hydroxynaphthalene 6-sulfon1e acid Do. 1,; Z-hydroxynaphthalene-7-sulionic acid 7 Do. lug dyestufi of this example the azo component 1-(4 ,8 2-1iydr0xybaphthalene 8-sulfonie aeid bluish grey. 3O 2 acetylamino 5 -hydroxynaphthalenegreenish blue. h 2 3 methyl 5 pyrazolone 9 9 v-suu ui oim p I spondingamountof a coupling component listed in the 513322232 5, d'5hydrxynaphthalene' bluish following table and otherwise proceeding in the same 31.5 2- 1 ir imi a-h urox naphthulenebluish gro' manner, dyestutfs of good fastne'ss properties are ob- S 0 03.0 tf" -7 H 32.0 1,3 dihydroxynaphthalene 3,6 disul bluish green. te lwl h y cotton m blue to blulsh green green 7 ionic acid. A 18h blue shades. 25.4 1 -'su1oph'enyl) -3 -methyl'- 5 -pyra bluish grey. 20 one. j L 3 f 1 $5,3 5, 5 e a f P. Parts by Azo component Dyeing on 20.4 1-phnyl-3-carboxy-5-pyrezolone ..D0. weight cotton lain..- s iclc etlgacettelacidta nllllllde 'reddlsh'grey. 40

y y P grey" 15.2"--- l-hydroxynaphthalene-3 6-disulf0mc acid. greenish blue. 7 1 hhjgglfigg; 918C; gthoxy -naphthalene 6 greenish blue. zo i i t l gfii 5l m id blueh P v ace ace to ac a e Y-; uis grey m f P i T 1? green 1-hydroxy-4-methylbenzene Do. 27.8 4-hydroxybenzene [1,1']-azobenzene 4-' brown. sulfonic acid.

Example 3 1 v r I Example 2 1 30A parts by weight (0.1 mol) of l-hydroxynaphtha- The copper c'omplex compound ofqtheynitrwmonoazo lene- ,6-d1sulfon1c acid are dissolved in 300 parts by dyesmfi of the formula: 5 volume of water, 180 parts by volume of a 20 percent sodium carbonate solution are added thereto, and the soan so n mixture is coupled at 0-5 C. with a diazoniurn salt solution obtained in usual manner from 26.8 parts by weight (0.1 mol) of 2-amino-6-nitro-naphthalene-8-sulfonic acid. When the coupling is completed, the product-is acidified with acetic acid and 140 parts by volj 7 ume-of a 20. percent sodium-acetate solution are added.

I F F R 39 9 A, After adding a solution of-25 grams 'of crystalline copqh uablg a o ding qfi mp e. P19 221 9; per sulfate in 140 parts by'volume of water and dispgr bytwegt (991ml) 2 -hy 9n p q solving the mixture by heating, 350 parts by volume -fl l 9 9 f i 9;Q P U of 7 of a 3 percent hydrogen peroxide solution are added by we g t g amm fi ut ou p h enee u 9m dropwise at 6065 -c. within about 4 hours, and stir- !d 5 P b fl l mi Wl PPP? al 3 1 ring-isco'ntinued for 90'minutes. Afterconcentration y w m m d c0PPWCOIHPlex of the toa small volume, the dyestuifthus obtained is separated by the addition of sodium chloride and isolated.

st'ufi having the "formula;

, Thedyes'tufiapaste is stirred'in 1500 p'arts'by volume of water, treated with 130 parts *by'volume of sodium hydroxide solution (40 B.) and a solution of 17.2 parts by weight of glucose in 60 parts by volume of water, and maintained at 50-60 C. for about 30 minutes, until the mondazo dyestutf can no longer be de- 7 tected. The dyestuff is isolated in usual manner. After drying it is a dark powder "which dissolves in water with a blue coloration and dyes cottonin blue shades of good fastness properties.

When replacing l-hydroxynaphthalene-3,6-disulfonic acid in this example by the equivalent amount of -l- 5 Ii'ydrOxynaphthaIene-S,8-disulfonic acid, 2-hydroxynaphthalene-3,6-disulfonic acid, 1-(4'-sulfophe'nyl)-3-niethyl- 5-pyrazolone, or 1- (4',8-disulfonaphthyl- [2'] -3-methyl- 5-pyifazolone, valuable dyestuffs are likewise obtained which dye cotton in blue to bluish grey shades.

Example 4 The copper complex of the dyestufi' having the formula:

OgN

obtainable according to the instruction of Example 1 by coupling 12.7 parts by weight of 1-(4-sulfophenyl)-3- m'ethyl-S-pyrazolone with the diazo compound of 17.4 parts ,by ,weight of Z-amino-6-nitro-naphthalene-4,8-disulfonic acid and oxidizing copperingrand the copper complex of the dyestuif having the formula:

obtainable according to the instruction of Example 3 from 12.7 parts by weight of 1-(4'-sulfophenyl)-3-methyl- 5-pyrazolone and the diazo compound from 13.4 parts by weight of Z-amino-6-nitro-naphthalene-8-sulfonic acid by coupling and oxidizing coppering, are stirred together in 1100 parts by volume of water, treated with 100 parts by volume of sodium hydroxide solution (40 B.) and 17.3 parts by weight of glucose in 60 parts by volume of water, heated to 50-60" C. and kept at this temperature, until no further monoazo dyestuif is detectable. The polyazo or -azoxy dyestuff thus obtained is isolated in usual manner. After drying, it is -a dark powder which dyes cotton in grey shades.

Example 5 The copper complex of the dyestufl having the formula:

H0 8 OH HO SO H obtainable according to the instruction of Example 1 from 15.2 parts by weight (0.05 mol) of 2-hyd1'oxynaphthalene-3,6-disulfonic acid and thediazo compound from 17.4 parts by weight of 2-amino-6-nitro-naphthalene-4,8-disulfonic acid by coupling and oxidizing coppering, and the copper complex .of the dyestuif having the formula:'

0,N noas so n obtainable according to the instruction of Example 3 by coupling 15.2 parts by weight of l-hydroxynaphthalene-3,6-disulfonic acid with 13.4 parts by weight of the diazo compound from 2-amino-6-nitro-naphthalene-8- sulfonic acid and subsequent oxidizing coppering, are stirred together in 1600 parts by volume of water, 150 parts by volume of sodium hydroxide solution (40 B.) and a solution of 17.2 parts by weight of glucose in parts by volume of water are added, the mixture is slowly heated to 55-60 C. and maintained at this temperature until the reduction of the nitro groups with the formation of an azo or azoxy bridge is completed. After cooling, the product is isolated in usual manner. The dry polyazo or -azoxy dyestufl? thus obtained is a dark powder which dissolves in water with a blue coloration and dyes cotton in a greenish blue shade.

Example 6 30.4 parts by weight (0.1 mol) of 2-hydroxynaphthalene-3,6-disulfonic acid are coupled with 34.8 parts by weight of 2-amino-6-nitro-naphthalene-4,8-disulfonic acid and isolated as indicated in Example 1. The dyestuif paste is stirred with 1800 parts by volume of water, treated with 150 parts by volume of sodium hydroxide solution (40 B.) and 17.3 parts by weight of glucose dissolved in 80 parts by volume of water, slowly heated to 60 C. and kept at this temperature for about 15 minutes, until no further monoazo dyestuif is detectable. The reaction mixture is rendered acid to Congo, treated wth sodium chloride, and the polyazo or -azoxy dyestufi thus formed is isolated.

The dyestuff paste obtained is stirred with 2000 parts by volume of water, parts by volume of a 20 percent sodium acetate solution are added, and the mixture is dissolved by heating after the addition of 25 parts by weight of crystalline copper sulfate in parts by volume of water. 340 parts by volume of a 3 percent hydrogen peroxide solution are then added dropwise with stirring at 60 C. within about 3 hours, and stirring is continued for 1 hour. The dyestuif is separated by the addition of sodium chloride and isolated. The dry dyestutf is a dark powder which dissolves in water with a blue coloration. The dyestufi which corresponds to the product obtained according to Example 1 dyes cotton in blue shades.

Example 7 The sodium salt of 30.4 parts by weight (0.1 mol) of 2-hydroxynaphthalene-3,6-disulfonic acid is dissolved in 300 parts by volume of water, coupled in a soda-alkaline medium at 0 C. with the equivalent amount (0.05 mol) of the tetrazo compound of the diamine having the formula:

SOgH

dropwise with stirring at 60 C. within about 3 hours, the color thereby changing to blue. After the addition of hydrogen peroxide is complete, the product is stirred for a further hour, salted out with sodium chloride and isolated.

The dry dyestu'fi is a dark powder which dissolves in water with a blue coloration and dyes cotton in blue shades. Thecompound corresponds to the products obtained according to the instruction of Examples 1 and 6. The dyestufi may be decoppered by usual methods and then treated with other metal-yielding agents, for example with nickel salts.

When instead of 2-hydroxynaphthalene-3,6-disulfonic acid the equivalent amount of 1-hydroxynaphthalene-3,6, S-trisulfonic acid is used, a dyestufi is obtained which dyes cotton i-na-g-reyish blue shade.

When replacing 2-hydroxynaphthalene-3,6-disulfonic acidby the equivalent amount of l-hydroxy-S-acetylaminonaphthalene-3,6=disulfonic acid, Z-hydroxy-S-acetylaminonaphthalene-6-sulfonic acid or Z-hydrOXy-S-acetylaminonaphthalene-7-sulfonic acid, and proceeding in an analogous manner to that described before, dyestuffs are obtained which dye cotton in blue shades of good fastness to light.

Example 8 d 0.05 mol of the tetrazotized diamino compound of the formula:

so rr soar:

(3) 803B. so rr I are coupled in a soda-alkaline medium with the solution of the sodium salt of 15.2 parts by weight (0.05 mol) of -2-hydroxynaphthalene 3,6-disulfonic acid at C. When the coupling is complete, a soda-alkaline solution of 19.2 parts by weight (0.05 mol) of 1-(4',8'-disulfonaphthyl-[Z'l)-3 methyl--pyrazolone is added and coupled. The dyestuff paste thus obtained is stirred with 3000 parts by volume of water, rendered weakly acid with acetic acid, treated with 140 parts by volume of a 20 percent sodium acetate solution and a solution of 25 parts by Weight of crystalline copper sulfate in 140 parts by volume of'water and heated to 90 C. for 15 minutes. 350 parts byvolu'me of a 3 percent hydrogen peroxide solution are added dropwise at 60 C. and a pH of about' 5.5 within approximately 3 hours. When the addition is complete, the reaction mixture is stirred for another hour, the dyestu ff'salted out with sodium chloride and isolated. The dry dyestuff is a dark powder which dissolves in water with a blue coloration and dyes cotton in reddish blue shades.

When instead of 2-hydroxynaphtha1ene-3,6-disulfonic acid and 1-(4T,8'disulfonaphthyl-[2'])-3-methyl-5-pyrazolone there is used 1-hydroxynaphthalene-3,6,8-trisulfonic acid and 2-acetylamino-5-hydroxynaphthalene 7 sulfonic acid, a dyestu'fi is obtained which dyes cotton in greyish blue shades.

. OH obtainable for example by diazotizing the o-benzenesulfonyl compound or 1echloro2amino-5 hydroxynaphthalene-7- sulfonic acid, coupling with 2-hydroxynaphtha-- lene-3,6-disulfonic acid and subsequent alkaline saponifiw cation, are dissolved in 600 parts by volume of water and combined in a soda-alkaline medium at 0 C. with a f solution ofithediazo compound of 34.8 parts by weight,

s on 01 HOSIS 0H 803B. is salted out with sodium chloride and isolated.

(b) The dyestufi paste obtained is stirred into 1450 parts by volume of water, rendered weakly acid (pH appr. 55) with acetic acid, and dissolved with heating with parts by volume of a 20 percent sodium acetate solution and a solution of 30 parts by weight of crystalline copper sulfate in 200 parts by volume of water. About 350 parts by volume of a 3 percent hydrogen peroxide solution are then added dropwise at 55-60 C. and aipH of 'appr. 55, until the reaction is complete. The disazo dyestulr thus coppered by oxidation is precipitated with sodium chloride and isolated.

(c) The isolated dyestuif paste is then stirred into about 600 parts by volume of water, treated with 60 parts by volume of a 40 percent by volume sodium hydroxide solution and a solution of 17.3 parts by weight of glucose in 60 par-ts by volume of water, and kept at about 60 C., until the reaction is complete. The dyestufi is isolated in usual manner and, desired, aftercoppered by usual methods.

After drying, it is a dark powder which dissolves in water with a blue coloration and dyes cotton in greenish grey shades.

The dyestufi may also be obtained by diazotizing 2- amino-6-nitronaphthalene-4,8-disulfonic acid and coupling with 1 chloro-2-amino-5-hydroxynaphthalene-7-sulfonic acid in the o-position to the S-standing hydroxy group, further diazotizingthe monoazo dyestufi thus obtained, coupling with 2-hydroxynaphthalene-3,6-disulfonic acid, coppering the disazo dyetuff thus obtained by oxidation as described above, subjecting it to an alkaline treatment with glucose, and, if desired, subsequent coppering.

If treating the copper-containing nitro-disazo dyestufi according to Example 9(b) with 0.1 mol of the dyestufi corresponding to the formula HOQ S -ou-( s o n s'ogn scan which is obtainedin accordance with the method described in Example 1, with glucose in alkaline medium and coppering in alkaline medium a tetradisazo dyestutf is obtained which dyes cotton in blue grey shades.

Example 10 .30-minutes. .After. rinsing with water anddrying a blue dyeing is obtained which is very fast to light.

9 10 We claim: 1. A copper complex of polyazo dyestuffs correspondwherein R and R stand for radicals of a coupling con1 ing to the formula ponent selected from the group consisting of the benzene,

HO 503E H035 OH naphthalene, pyrazolone, aceto acetic-acid anilide, 2120- OH HO 5 benzene and azo-naphthalene series, said radicals bearing the hydroxyl group in o-position to the azo bridge and (g) X means a member selected from the group consisting of hydrogen and a sulfonic acid group.

2. The copper complex of the polyazo dyestufi corre- X X sponding to the formula.

H038 OH HO siosl-l H038 313 H0 80,13:

0 g [1141111 1118 $03K $03K S0311 03H spending to the formula E: HO S0 11 H0 8 OH E:

OH HO N=N 803E: N=N SO H N=N HO S OH H 0 H (0 0 H H H 03H References Cited in the file of this patent UNITED STATES PATENTS 709,186 Weinberg et a1 Sept. 16, 1902 1,788,797 Jordan Jan. 13, 1931 1,819,080 Dewey Aug. 18, 1931 FOREIGN PATENTS 670,522 Great Britain Apr. 23, 1952 OTHER REFERENCES Venkataraman, K.: Synthetic Dyes," volume I, p. 544. 

1. A COPPER COMPLEX OF POLYAZO DYESTUFFS CORRESPONDING TO THE FORMULA 